Singapore startup Volarious has launched the V-Line, a tether system designed to keep DJI’s Mavic 2 drones in the air indefinitely. The V-Line tether box weighs close to 15 kg, so it’s portable enough. It’s been engineered from the ground up to work with the Mavic 2 series, including a patented ‘smart tension’ system, which adjusts to the force of the drone and finds the perfect balance to help it hover steady, without anything getting tangled up in the cable.